FCA MiFIR Transaction Reporting

Understand, validate and oversee UK MiFIR transaction reporting with confidence

UK MiFIR transaction reporting is designed to support FCA market oversight by requiring complete and accurate transaction reports under Article 26 of UK MiFIR. The FCA states that complete and accurate transaction reports play a critical role in its ability to monitor markets and support the work of other regulatory authorities, including the Bank of England.

For firms in scope, the challenge is not simply sending files to an ARM or to the FCA. It is demonstrating that reportable transactions have been identified correctly, that client, trader, algorithm and instrument data is complete and accurate, and that there are policies and controls in place to ensure accurate reporting. The FCA is also consulting on reforms to improve the future UK transaction reporting regime.

What is UK MiFIR Reporting?

UK MiFIR transaction reporting refers to the obligation under Article 26 of UK MiFIR for investment firms to report prescribed details of reportable transactions to the FCA by the following working day. The framework is supported by UK legislation, the FCA Handbook and applicable guidance.

The UK regime broadly reflects the EU MiFIR model onshored into UK law, but it is now the subject of active FCA reform work aimed at creating a more proportionate and agile framework. That means firms need to manage both current-state compliance and future-state change.

Who is required to report under UK MiFIR reporting?

UK MiFIR transaction reporting applies to UK investment firms and UK branches of third-country firms that execute transactions in financial instruments.

Reports are often submitted via an Approved Reporting Mechanism (ARM), but operational use of an ARM does not remove the need for strong control over scope, enrichment, reconciliation and exception management.

Scope and UK nexus

UK MiFIR transaction reporting encompasses transactions executed by UK investment firms and their global branches, as well as non-UK entities executing transactions through their UK branches.

The reporting obligation captures transactions in financial instruments in scope under Article 26(2), including instruments traded on a trading venue or admitted to trading, or where the underlying is such an instrument, subject to the detailed perimeter in the legislation and associated standards.

For firms operating cross-border, that makes instrument reference data, entity scoping, client and trader mapping, and execution flow analysis especially important. In practice, firms need to be confident that they can apply the rules consistently across branches, legal entities and reporting workflows.

What must be reported?

UK MiFIR transaction reports include prescribed details relating to:

• the entity executing the transaction

• persons or algorithms responsible for the investment decision and execution

• details of the buyer and seller of the transaction

• details of the people or algorithms making the decision to buy or sell the financial instrument

• instrument identification code or product characteristics of the financial instrument being transacted

• economic details of the transaction

• execution date and time

• venue of execution

• short sale and waiver indicators where relevant

Reporting deadlines

UK MiFIR transaction reporting is generally subject to a T+1 reporting timeline. Firms must report no later than the following business day after execution

For firms in scope, that means reporting timeliness depends on prompt transaction capture, stable instrument and participant data, robust enrichment logic and a process capable of detecting and correcting errors quickly enough to avoid recurring quality issues.

Is UK MiFIR reporting single-sided, dual-sided or delegated?

UK MiFIR is not a trade repository regime and is not best described through single-sided or dual-sided shorthand. It is an investment-firm transaction reporting obligation to the FCA, often operationalised through an ARM.

Operationally, firms may rely on ARMs and service providers, but the regulatory expectation remains that firms understand and control their reporting obligations, their data enrichment and the quality of their final reports.

Are there UK MiFIR reporting exemptions or reliefs?

Under Article 2(5) of RTS 22, the definition of a “transaction” excludes activities that do not reflect a new investment decision by an investor. These exemptions broadly include financing and clearing activities, such as securities financing transactions and contracts arising solely from clearing or settlement, as well as operational or custodial movements including collateral transfers and custody-driven changes. They also cover post-trade lifecycle events, such as novations, portfolio compression, and derivative adjustments, and transactions that arise automatically from pre-determined contractual terms or corporate actions, for example exercises, redemptions, dividend reinvestment plans, or the creation and redemption of fund units.

In addition, investment firms may rely on the transmission conditions set out in Article 4 of MiFIR Article 26 transaction reporting, under which a firm that transmits an order to another investment firm for execution is deemed to have satisfied its reporting obligation, provided it transmits all required transaction details and the receiving firm agrees to report the transaction.

Consequences of non-compliance

UK MiFIR transaction reporting failures create regulatory, operational and reputational risk, particularly where firms cannot evidence control over scope, participant identifiers, trader / algorithm attribution, instrument reference data and timeliness. The FCA uses transaction reports to monitor markets and support the work of other authorities, making data quality a core supervisory issue.

For firms in scope, the expectation is clear: transaction reports must be accurate, timely and supported by a defensible control framework.

How En:ACT helps with UK MiFIR reporting oversight

En:ACT helps firms strengthen control over their UK MiFIR reporting obligations by ingesting raw transaction data from any source system, performing books and records reconciliation, and assessing 100% of transactions and fields against the applicable UK MiFIR rules.

Using transparent, regulator-linked logic, the platform identifies:

• product and entity eligibility issues

• field-level errors

• cross-field inconsistencies

• missing or stale instrument data

• LEI and client identifier problems

• trader / algorithm attribution gaps

• timing and venue anomalies

Each identified issue is linked directly to the specific UK MiFIR rule breached, giving firms a clear view of what is wrong, why it matters and where remediation is required.

En:ACT also ensures rules are kept up to date to reflect developments across:

• regulatory text

• regulator guidance

• consultation papers

• relevant industry papers

For UK MiFIR specifically, that means firms benefit from rule coverage maintained in line with Article 26 of UK MiFIR, the FCA Handbook and FCA guidance and consultation material.

Specialist UK MiFIR expertise from the Novatus Intelligence team

Our UK MiFIR capability is supported by specialists within the Novatus Intelligence team, including SMEs with backgrounds across banking, asset management, product and regulation.

For UK MiFIR specifically, that means access to specialists who understand FCA transaction reporting expectations, UK MiFIR perimeter issues and practical reporting control design.

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Common UK MiFIR reporting challenges

Some of the most common UK MiFIR reporting issues include:

• incorrect scope assessment

• incomplete client identifiers

• trader / algorithm mapping failures

• missing or stale instrument reference data

• poor timing control

• weak reconciliation between internal records and FCA submissions

In many cases, the issue is not one bad field. It is a mismatch between the transaction as executed, the enrichment applied to it and the final report delivered to the FCA.

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Why firms choose En:ACT for UK MiFIR oversight

Firms use En:ACT because it gives them more than a validation tool. It provides a control framework around UK MiFIR transaction reporting.

With En:ACT, firms can:

• test reporting quality against transparent rule logic

• reconcile source data to reported data

• identify issues before they become regulatory problems

• benchmark reporting quality over time

• evidence oversight of ARM reporting models

• prepare for change with greater confidence

The result is stronger reporting assurance, better governance and a clearer line of sight from raw transaction data to FCA submission quality.

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